refactor: harden sqlite runtime and packaged startup flow

- refine config loading with --config and current-directory .env

- improve sqlite busy handling and runtime DB tuning

- restore telegram payment notification and wallet input flow

- add behavior-based config and callback recovery tests

src/command/root.go

@@ -1,6 +1,11 @@
 package command
 
-import "github.com/spf13/cobra"
+import (
+	"github.com/assimon/luuu/config"
+	"github.com/spf13/cobra"
+)
+
+var configPath string
 
 var rootCmd = &cobra.Command{}
 
@@ -9,5 +14,9 @@ func Execute() error {
 }
 
 func init() {
+	rootCmd.PersistentFlags().StringVar(&configPath, "config", "", "path to .env or directory containing .env")
+	rootCmd.PersistentPreRun = func(cmd *cobra.Command, args []string) {
+		config.SetConfigPath(configPath)
+	}
 	rootCmd.AddCommand(httpCmd)
 }